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Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

  1. Arrow Sticky Thread Sticky: Please Read This Before Posting

    Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

    Started by quark‎, 11-10-2005 12:21 AM
    • Replies: 0
    • Views: 30,061
    11-10-2005, 12:21 AM Go to last post
  1. parametric or non-parametric in comparison of a dependent variable within several gro

    down vote favorite I am comparing maths and chemistry scores of students in several schools. I am not comparing the schools with each other. I am...

    Started by tabrizbalasi‎, 06-09-2016 04:15 PM
    nonparametric, normal distribution, normality, parametric
    • Replies: 0
    • Views: 817
    06-09-2016, 04:15 PM Go to last post
  2. How often is the null hypothesis true in psychology?

    Hullo all, Something that I'm really interested in is the question of what should be the "default" form of statistical analysis used by everyday...

    Started by CowboyBear‎, 04-17-2016 12:08 AM
    2 Pages
    1 2
    • Replies: 29
    • Views: 3,171
    06-08-2016, 09:30 PM Go to last post
  3. Meta-analysis to compare 3 randomized control trials?

    I'm proposing to evaluate an outcome in three completed randomized controlled trials. The primary goal is to analyze a new outcome in each data set...

    Started by ACAD‎, 06-07-2016 11:15 PM
    manova, meta-analysis, randomized control trials
    • Replies: 0
    • Views: 902
    06-07-2016, 11:15 PM Go to last post
  4. Lightbulb Studying the combined effects of mothers and fathers depression on child outcomes

    Hello everyone! I am new here and am really needing some advice on what is the best statistical method to use for my doctoral research. The...

    Started by rachrach‎, 06-07-2016 01:40 PM
    combined effects, dyadic data, family data, multilevel modelling
    • Replies: 1
    • Views: 767
    06-07-2016, 03:06 PM Go to last post
  5. How to analyze categorical data with repeated measures?

    Dear all, I struggle with the analysis of my data and thought someone here has a suggestion for me. I measured the categorical responses in a...

    Started by footos‎, 06-07-2016 10:51 AM
    • Replies: 0
    • Views: 645
    06-07-2016, 10:51 AM Go to last post
  6. Two-way or one-way MANOVA?

    Hi all! I'm struggling with the following design: I had 257 respondents filling in my survey with a manipulated website. The website was...

    Started by Rob1913‎, 06-07-2016 06:41 AM
    manova; two-way; one-way
    • Replies: 3
    • Views: 819
    06-07-2016, 09:03 AM Go to last post
  7. Interpreting repeated measures ANOVA results in Intervention Study

    I'm having one of those late night working problems, where I'm suddenly second guessing all my work and I seem to have lost all my statistics...

    Started by cait‎, 04-06-2016 12:49 AM
    intervention, repeated measures
    • Replies: 3
    • Views: 2,337
    06-06-2016, 06:51 AM Go to last post
  8. Identify Outlier

    Hi, I need help to identify outlier for my research project :) Model: 2x2 moderated mediation 1.) IV: both are nominal (rich vs. poor & public...

    Started by yologer‎, 06-02-2016 06:25 PM
    mediation, moderated, outlier
    • Replies: 2
    • Views: 1,306
    06-04-2016, 05:49 PM Go to last post
  9. Question Choosing the right statistical analysis for my research

    Hi all, I was wondering if anyone could help me. I'm struggling to figure out which type of analysis I need to use for my research: I have 900...

    Started by lzid‎, 06-03-2016 07:42 AM
    • Replies: 2
    • Views: 839
    06-04-2016, 04:41 AM Go to last post
  10. Methods and Data Analysis for Experimental Study Design

    Good day! I am working on my methods section for my dissertation proposal and want to ensure I am thinking through my methods and data analysis...

    Started by CupcakeKat‎, 06-02-2016 02:54 PM
    data analysis, manova, research design
    • Replies: 2
    • Views: 1,662
    06-03-2016, 06:54 PM Go to last post
  11. calculating variance of mean proportions for meta-analysis

    We aim to do a meta-analysis on mean proportions using. Thus, individual proportions (accuracy scores) within a study are already averaged to a mean...

    Started by Anne Fleur‎, 06-03-2016 07:08 AM
    • Replies: 1
    • Views: 819
    06-03-2016, 11:51 AM Go to last post
  12. Reporting participant numbers for meta analysis

    Hi there, I am hoping you may be able to help me with a query I have. I am conducting a meta analysis on Random Control Trials using REVMAN. I...

    Started by tcr‎, 06-01-2016 11:40 AM
    means, meta analysis, population, revman, standard deviation
    • Replies: 2
    • Views: 759
    06-03-2016, 07:31 AM Go to last post
  13. How to adjust means?

    I have two teachers giving marks to two groups of students in one class.I find that one of the teachers is more lenient in marking therefore he gives...

    Started by pancy‎, 05-24-2016 11:06 PM
    • Replies: 3
    • Views: 829
    06-01-2016, 11:05 PM Go to last post
  14. Question about performing ANOVA

    Hello Everyone! I am Andrew and i am a new member! I have conducted my own research and i am about to report the results and i would appreciate...

    Started by Kantekas‎, 05-29-2016 01:06 PM
    • Replies: 3
    • Views: 948
    05-29-2016, 04:18 PM Go to last post
  15. Compare means of subgroups of same population

    Hi :wave: I tested life satisfaction on a sample of 500 respondents. In the same questionaire I also tested whether the respondent was a smoker or...

    Started by guszfraba‎, 05-27-2016 02:15 PM
    • Replies: 2
    • Views: 1,462
    05-27-2016, 03:54 PM Go to last post
  16. Question Please help: ANOVA

    I'm asking a group of young people who have experienced loss to complete the Posttraumatic Growth Inventory and then a sheet about different factors...

    Started by bremner‎, 05-25-2016 07:05 AM
    anova, sample size, test
    • Replies: 2
    • Views: 659
    05-27-2016, 01:28 PM Go to last post
  17. Question Help with Nested Design

    Hello members, I'm hoping you astute scholars can help me with a stat problem that I can't figure out. I'm stuck at one part of the analysis,...

    Started by rothers27‎, 05-25-2016 12:13 PM
    • Replies: 1
    • Views: 711
    05-26-2016, 11:44 AM Go to last post
  18. Designing a chi square test

    Hi, I have some doubts about designing in the most correct form a chi-square test. In my experiment, I used 41 visual stimuli (pictures), which...

    Started by giggia1987‎, 05-25-2016 09:59 AM
    • Replies: 0
    • Views: 561
    05-25-2016, 09:59 AM Go to last post
  19. Repeated Measures Design & Effect Sizes, Normality

    My question is about calculating effect sizes for a repeated measures design with a small sample size. I want to calculate Cohen's d.av (as...

    Started by gradstudent1507‎, 05-21-2016 05:40 PM
    effect size
    • Replies: 1
    • Views: 846
    05-22-2016, 06:25 AM Go to last post
  20. t-test: very odd p value..

    Hello, I have a strange p value and I am not sure how to interpret it: t = 5.3592, df = 46.353, p-value = 2.56e-06 Anyone know what to do...

    Started by Ted1234‎, 05-19-2016 07:26 PM
    t-test
    • Replies: 5
    • Views: 1,130
    05-20-2016, 09:05 AM Go to last post
  21. Comparing two means of small sample groups - which statistic should I use?

    Hello, As I am struggling a bit with the statistics part of my bachelors thesis, I would appreciate your help and opinions a lot! I've got two...

    Started by Snape_lape‎, 05-17-2016 10:44 AM
    permutations test
    • Replies: 4
    • Views: 1,068
    05-18-2016, 09:28 AM Go to last post
  22. Question Analysis of rhythm precision - Which test should I use?

    Greetings everyone, I am currently analysing the data which I gathered from my master thesis experiment. My experiment involves measurements of...

    Started by Thorgeir‎, 05-16-2016 08:58 AM
    rhythm method, rhythm precision
    • Replies: 0
    • Views: 930
    05-16-2016, 08:58 AM Go to last post
  23. Organizing data within SPSS for 2x2x2 repeated measures ANOVA

    Hello, I have some data derived from a 2x2x2 experimental design. There are 3 IV's, each with 2 levels. My DV is reaction time (measured in...

    Started by Ted1234‎, 05-14-2016 05:00 PM
    spss
    • Replies: 0
    • Views: 936
    05-14-2016, 05:00 PM Go to last post
  24. Exclamation HELP PLEASE- Correlation between groups

    My objective is to see if there is any relationship between sleep, anxiety and depression. I distributed 3 scales measuring sleep, anxiety and...

    Started by Rysa‎, 05-13-2016 12:40 PM
    • Replies: 1
    • Views: 1,037
    05-14-2016, 03:30 PM Go to last post
  25. Ancova help please

    Hey guys i have a few questions below that I need help with. Anyone please. I can't wrap my head around it even after all the reading. QUESTION 1...

    Started by mistfolk‎, 05-14-2016 11:01 AM
    • Replies: 0
    • Views: 983
    05-14-2016, 11:01 AM Go to last post
  26. How to perform ANOVA with two groups

    Dear Stats Gurus, I hope you can help me with my problem. I'm about to develop an old empirical work of mine, but I don't quite know how. In...

    Started by blaness‎, 05-08-2016 04:06 PM
    • Replies: 4
    • Views: 1,723
    05-13-2016, 04:12 AM Go to last post
  27. Outliers, winorising and t-test

    I have two group of 25 and 27 people. I want to compare them on a sex activity score that vary from 0 to 9. My distribution is algedly normal,...

    Started by lexas‎, 05-12-2016 09:22 PM
    outliers, spps
    • Replies: 1
    • Views: 717
    05-13-2016, 02:29 AM Go to last post
  28. Need help with the correct analysis

    HI I can't wrap my head around what type of Anova i need to use for my data and if my way of thinking is correct. Been to long since i've used...

    Started by Bobson‎, 05-12-2016 05:14 PM
    • Replies: 0
    • Views: 524
    05-12-2016, 05:14 PM Go to last post
  29. Help with clarification of design and statistical procedure of study

    Hello forum, I'm desperately looking for some input and help concerning a study for my doctoral project. I will outline the basic setting and my...

    Started by Helpstats‎, 05-12-2016 10:41 AM
    • Replies: 1
    • Views: 604
    05-12-2016, 03:13 PM Go to last post
  30. Help with mixed model analysis

    sssssssssssss

    Started by Chia‎, 05-12-2016 02:47 PM
    experience sampling, mixed between anova, mixed model, multilevel modeling
    • Replies: 0
    • Views: 493
    05-12-2016, 02:47 PM Go to last post
  31. Lightbulb Which statistical analysis to run?

    Hi All, I'm currently working on my psychology project however, struggling with the results section; I'm not quite sure which analysis to run. ...

    Started by hazedem‎, 05-09-2016 10:30 AM
    psychology, statistical analysis
    • Replies: 4
    • Views: 1,680
    05-10-2016, 05:43 AM Go to last post
  32. Talking Proper analysis for group differences in proportion scores

    Hello all, I am running analyses looking at group differences in the proportion of time kids were distressed in a task. I have a task that has...

    Started by bonnieerin‎, 05-07-2016 03:15 PM
    group differences, kruskal wallis, non normal distribution, proportion test, proportions
    • Replies: 0
    • Views: 895
    05-07-2016, 03:15 PM Go to last post
  33. statisical help

    A clinical psychologist is studying the efficacy of a new drug medication for depression. The study includes a placebo group (no medication) versus a...

    Started by don09‎, 05-06-2016 04:35 PM
    • Replies: 1
    • Views: 3,111
    05-07-2016, 06:06 AM Go to last post
  34. Narcissism in organizations

    For my thesis I have to describe (not execute) a research plan. 374 Employees of a certain company need to fill in a survey, which consist of two...

    Started by milano‎, 05-04-2016 06:43 PM
    • Replies: 0
    • Views: 733
    05-04-2016, 06:43 PM Go to last post
  35. Using repeated measures change/trend as a predictor variable

    I have repeated measures of happiness for a sample of participants, and a single measure of satisfaction for each of the participants. I want to...

    Started by replica‎, 05-04-2016 08:20 AM
    change-scores, regression-coefficients, repeated-measures, trend
    • Replies: 0
    • Views: 443
    05-04-2016, 08:20 AM Go to last post
  36. Pearson's Partial Correlation - Transforming one non-normally distributed variable

    Hi all, I would be really grateful if someone could advise me on an issue I am having. I am carrying out research looking at the relationship...

    Started by DeirdreTwomey‎, 05-02-2016 10:00 AM
    log10, normality issue, normality transformations
    • Replies: 1
    • Views: 2,505
    05-02-2016, 11:10 AM Go to last post
  37. Question Dyadic repeated measures with moderation - how to analyze?

    Hi, I want to test the effects of the emotions expressed in private online chats between males and females (dyadic chats) on the female's...

    Started by replica‎, 04-29-2016 08:58 AM
    • Replies: 0
    • Views: 526
    04-29-2016, 08:58 AM Go to last post
  38. Having trouble trying to decided which statistical analysis to use.

    I'm writing a paper about Birth Order and Big 5 Personality test. I have Birth order in one column separated as 1= first borns and 2= laterborns....

    Started by daisyresend‎, 04-26-2016 08:29 PM
    psychology report, spss 22, statistics help
    • Replies: 2
    • Views: 900
    04-29-2016, 07:25 AM Go to last post
  39. Likert scale analysis - ordinal or interval??

    Hi, I would appreciate some help so much as I feel I am going round in circles with every journal article I read! So I am currently trying to...

    Started by indie92‎, 04-21-2016 01:35 PM
    2 Pages
    1 2
    lickert, t-test
    • Replies: 26
    • Views: 2,618
    04-26-2016, 06:31 PM Go to last post
  40. Age as covariate?

    Hi all, I’ve been struggling with this problem for a while now. The answer is probably pretty straightforward, but I’m not sure what to do...

    Started by Bee.‎, 04-22-2016 05:07 AM
    • Replies: 5
    • Views: 1,146
    04-25-2016, 04:00 AM Go to last post
  41. What analysis for within measures on ordinal scale?

    Hi All, I have test scores on an ordinal scale (1-5). All participants took the test twice, but with different time intervals. I want to see if...

    Started by Sam31‎, 04-24-2016 10:01 AM
    • Replies: 0
    • Views: 694
    04-24-2016, 10:01 AM Go to last post
  42. Decomposing a mixed model custom ANCOVA

    Here is my scenario. The first paragraph tells a bit about the methods we used to give you a frame of reference. The second tells about the first...

    Started by dynamite‎, 04-22-2016 03:35 PM
    covariate, personality, psychology, repeated ancova
    • Replies: 0
    • Views: 587
    04-22-2016, 03:35 PM Go to last post
  43. How to handle missing data?

    Hi, I just finished an online study in which participants filled out several questionnaires at baseline and after 6 weeks (posttest). There were...

    Started by EvaDJ‎, 04-22-2016 07:59 AM
    dropout, missing data, multiple imputation, rct
    • Replies: 5
    • Views: 809
    04-22-2016, 03:20 PM Go to last post
  44. Which analysis for incomplete block design with repeated measure?

    I have a question on analyzing data from an incomplete block design. Participants have been randomly assigned to 1 out of 8 procedures each...

    Started by Noppa‎, 04-22-2016 04:23 AM
    anova, incomlete block design, repeated measures design
    • Replies: 0
    • Views: 406
    04-22-2016, 04:23 AM Go to last post
  45. What statistical test

    I need help in knowing what statistical test I should use for this problem in SPSS. The choices are One instructor who taught Advanced...

    Started by klm225‎, 04-19-2016 06:08 PM
    • Replies: 2
    • Views: 1,643
    04-19-2016, 08:19 PM Go to last post
  46. Paired samples t-test for an interaction

    Hi all, I'm currently writing up my final project for university. The general idea is testing the role of language on emotion perception in...

    Started by sm4l‎, 04-19-2016 07:22 AM
    anova, psychology, spss, t-test
    • Replies: 0
    • Views: 1,425
    04-19-2016, 07:22 AM Go to last post
  47. How to understand these (discrepant?) findings?

    Hi everyone, I'm doing a project where I'm developing/validating a new questionnaire about body image (BodyImageNEW). I'm comparing it to an...

    Started by DefenceDoom‎, 04-18-2016 07:21 PM
    dfa, findings, hml
    • Replies: 1
    • Views: 888
    04-19-2016, 02:37 AM Go to last post
  48. Which test should I use for this unusual type of data obtained from a diary study?

    Hi, any help on my issue would be greatly appreciated :) I am having real trouble analysing the data for my Psychology dissertation. I am...

    Started by charliespin1‎, 04-16-2016 09:11 PM
    • Replies: 8
    • Views: 1,390
    04-17-2016, 03:42 PM Go to last post
  49. Multiple regression- model non-significant, but a significant predictor?

    Hi, I'm currently analyzing the results for my final year dissertation. For one of my multiple regressions, the overall regression model is...

    Started by twinpeaks‎, 04-16-2016 10:03 AM
    • Replies: 5
    • Views: 1,201
    04-17-2016, 02:45 AM Go to last post
  50. A 6th response option ("I don't know") added to a 5-point Likert scale. Is data lost?

    Hello, everyone, I need a little bit of help salvaging the data from a questionnaire. One of my colleagues applied a questionnaire, but...

    Started by streamline55‎, 04-12-2016 02:09 AM
    convert, imputation, likert, transform
    • Replies: 9
    • Views: 1,083
    04-15-2016, 12:54 PM Go to last post
  51. Am I understanding/describing this right? (chi sq, confidence intervals, ACE model)

    The experiment is a twin study - using pairs of twins to investigate similarities and differences and look at how much genes and environment...

    Started by emmaburge‎, 04-14-2016 08:58 AM
    ace model, chi square, confidence interval
    • Replies: 0
    • Views: 549
    04-14-2016, 08:58 AM Go to last post
  52. Separating a predictor variable using median split vs..

    ... standard deviations from the mean. Hi, I'd just like some clarification on something concerning the analysis for my research project. In...

    Started by twinpeaks‎, 04-10-2016 09:32 AM
    • Replies: 1
    • Views: 1,104
    04-12-2016, 01:43 AM Go to last post
  53. Question Help needed choosing statistical test

    Hi, I'm new to this forum and hoping someone can help me. I've collected some data but I am confused over which test to use to analyse it. ...

    Started by Dragonfly‎, 04-07-2016 10:37 AM
    psychology experiment, spss, statistical help, test to use
    • Replies: 2
    • Views: 1,111
    04-10-2016, 05:45 AM Go to last post
  54. Should I use ANCOVA or T Test, if I stratify my participants for randomisation?

    Hi, I am writing a proposal which randomises participants into two groups, but before randomisation i stratify by age and diagnoses (3 categories...

    Started by applepeach‎, 04-09-2016 09:27 AM
    • Replies: 0
    • Views: 1,028
    04-09-2016, 09:27 AM Go to last post
  55. Inter-subject agreement re timings of (unequal number of) events

    Hi everyone, I am trying to figure out what would be the best statistic to use to quantify the amount of agreement that exists between subjects...

    Started by wildetudor‎, 04-05-2016 03:25 AM
    inter-observer, inter-rater reliability, kendall tau, time series
    • Replies: 1
    • Views: 1,662
    04-09-2016, 07:32 AM Go to last post
  56. Need help formatting my Data!

    Hello All, (Please be prepared for minimum knowledge on my behalf!) I am currently doing some research for university so time is of the essence! ...

    Started by Georgeneedshelp‎, 04-06-2016 11:03 AM
    anova
    • Replies: 0
    • Views: 700
    04-06-2016, 11:03 AM Go to last post
  57. Which spss tests to run to compare my demographic results to my attitude score result

    Hi, I'm new to spss and i'm lost trying to do my thesis! :( I have all my descriptive stats in order and I've worked out an attitude score for...

    Started by FastAwake‎, 03-30-2016 08:41 AM
    • Replies: 3
    • Views: 901
    04-04-2016, 03:50 PM Go to last post
  58. Smile Random, non-linear relationship scatter-plot - Multiple Regression

    I'm analysing questionnaire responses. The questionnaire is based on the Theory of Planned Behaviour. There are 3 variables, which all supposedly...

    Started by WL93‎, 04-01-2016 04:07 AM
    • Replies: 2
    • Views: 1,011
    04-04-2016, 03:47 PM Go to last post
  59. Statistical independence

    Hello. I have a question about statistical independence. I know that this assumption is not met when you have two or more observations from the...

    Started by Toshi‎, 03-26-2016 03:38 AM
    statistical independence
    • Replies: 2
    • Views: 979
    04-02-2016, 09:43 PM Go to last post
  60. 2-Step Mediation With Multi-level Data

    Hello, I have data in which each participant responded 5 times to some questions. We want to run a mediation model in with X --> M1 --> M2 --> Y,...

    Started by einesi‎, 04-01-2016 10:05 AM
    mediation, multilevel model
    • Replies: 1
    • Views: 909
    04-02-2016, 02:17 AM Go to last post

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